Circle Vocabulary

Front

What is the distance from the center of a circle to the boundary of the circle called?

Back

Radius

Front

What is the term for an angle formed by two chords in a circle that share an endpoint?

Back

Inscribed Angle

Front

What do you call a line segment whose endpoints lie on the circle?

Back

Chord

Front

What is the term for half of a circle, which is the distance from one point on the circle to another point directly opposite it?

Back

Semi-Circle

Front

What is the term for a portion of the circumference of a circle that is larger than a semicircle?

Back

Major Arc

Front

What is the term for the longest distance across a circle, passing through the center?

Back

Diameter

Front

What is the term for a line that touches a circle at exactly one point?

Back

Tangent

Front

What is the area of a circle formula?

Back

Area = πr², where r is the radius.

Front

What is the circumference of a circle formula?

Back

Circumference = 2πr or Circumference = πd, where d is the diameter.

Front

What is the term for a portion of the circumference of a circle that is smaller than a semicircle?

Back

Minor Arc